package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        log.info("开始发送验证码，手机号为：{}", phone);
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        String code = RandomUtil.randomNumbers(6);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.debug("发送验证码成功，验证码为：{}", code);
        // 调试阶段返回验证码，生产环境请务必移除！
        return Result.ok(code);
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        User user = null;

        // 1. 验证码登录分支
        String code = loginForm.getCode();
        if (code != null && !code.isEmpty()) {
            // 从 Redis 获取验证码
            String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
            if (cacheCode == null) {
                return Result.fail("验证码已过期，请重新获取");
            }
            if (!cacheCode.equals(code)) {
                return Result.fail("验证码错误");
            }
            // 验证成功即删除验证码（安全）
            stringRedisTemplate.delete(LOGIN_CODE_KEY + phone);
            // 查用户
            user = query().eq("phone", phone).one();
            if (user == null) {
                user = createUserWithPhone(phone);
            }
        } else if (loginForm.getPassword() != null && !loginForm.getPassword().isEmpty()) {
            // 2. 密码登录分支（如有密码功能）
            user = query().eq("phone", phone).one();
            if (user == null || user.getPassword() == null || !user.getPassword().equals(loginForm.getPassword())) {
                return Result.fail("手机号或密码错误");
            }
        } else {
            return Result.fail("请提供验证码或密码");
        }
        // 3. 保存用户信息到 Session（或可改为Token+Redis方案）
        String token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue( true)
                        .setFieldValueEditor((fieldName,fieldvalue)->fieldvalue.toString()));
        //储存token
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token, userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL , TimeUnit.MINUTES);
        // 4. 返回DTO
        return Result.ok(token);
    }

    // 用手机号自动注册新用户
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
